Code for one liner isFlashExists variable:
<script type='text/javascript'
src='//ajax.googleapis.com/ajax/libs/swfobject/2.2/swfobject.js'> </script>
<script type='text/javascript'>
var isFlashExists = swfobject.hasFlashPlayerVersion('1') ? true : false ;
if (isFlashExists) {
alert ('flash exists');
} else {
alert ('NO flash');
}
</script>
Note that there is an alternative like this: swfobject.getFlashPlayerVersion();